[BUG] ValueSet $expand doesn't always return a display

[vesnushka]

Describe the bug

ValueSet $expand doesn't always return a display

Severity

Major

Steps to reproduce the behavior:

1. Load terminology http://hl7.org/fhir/ValueSet/yesnodontknow
2. In REST console try GET /ValueSet/yesnodontknow/$expand It returns the result with missing display for Y and N code

   
   ...
   name: Yes-No-Don't-Know
   resourceType: ValueSet
   expansion:
   timestamp: 2023-06-15T12:35:09.464Z
   identifier: http://hl7.org/fhir/ValueSet/yesnodontknow
   contains:
   - code: 'N'
     system: http://terminology.hl7.org/CodeSystem/v2-0532
   - code: asked-unknown
     system: http://terminology.hl7.org/CodeSystem/data-absent-reason
     display: Don't know
   - code: 'Y'
     system: http://terminology.hl7.org/CodeSystem/v2-0532
   ...
   id: yesnodontknow
   url: http://hl7.org/fhir/ValueSet/yesnodontknow
   version: 4.0.1
   _source: zen.fhir
   ...

3. Meanwhile trying `GET /ValueSet/yesnodontknow` in REST console
returns correct ValueSet with all the displays
```yaml
...
name: Yes-No-Don't-Know
resourceType: ValueSet
expansion:
  contains:
    - code: 'Y'
      system: http://terminology.hl7.org/CodeSystem/v2-0136
      display: 'Yes'
    - code: 'N'
      system: http://terminology.hl7.org/CodeSystem/v2-0136
      display: 'No'
    - code: asked-unknown
      system: http://terminology.hl7.org/CodeSystem/data-absent-reason
      display: Don't know
  timestamp: '2015-07-14T10:00:00Z'
  identifier: urn:uuid:bf99fe50-2c2b-41ad-bd63-bee6919810b4
...
id: yesnodontknow
url: http://hl7.org/fhir/ValueSet/yesnodontknow
version: 4.0.1
_source: zen.fhir

Expected behavior

Request /ValueSet/yesnodontknow/$expand has to return ValueSet with all the displays

...
name: Yes-No-Don't-Know
resourceType: ValueSet
expansion:
  ...
  contains:
    - code: 'N'
      system: http://terminology.hl7.org/CodeSystem/v2-0532
      display: 'No'
    - code: asked-unknown
      system: http://terminology.hl7.org/CodeSystem/data-absent-reason
      display: Don't know
    - code: 'Y'
      system: http://terminology.hl7.org/CodeSystem/v2-0532
      display: 'Yes'
...

Versions:

• Aidbox image version:

  edge v:2306.9241f01f